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Добірка наукової літератури з теми "Acide furanique"
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Статті в журналах з теми "Acide furanique"
Alvarado, Katherine, Erwann Durand, Laurent Vaysse, Siriluck Liengprayoon, Sylvie Gaillet, Charles Coudray, François Casas, and Christine Feillet-Coudray. "Effets bénéfiques potentiels des acides gras furaniques, des lipides alimentaires bioactifs." Cahiers de Nutrition et de Diététique 56, no. 2 (April 2021): 117–25. http://dx.doi.org/10.1016/j.cnd.2021.01.006.
Повний текст джерелаNasakin, Oleg E., Pavel A. Egorov, Alevtina A. Sazanova, Elvira N. Shalfeeva, and Svetlana Yu Vasilyeva. "FURANIUM COMPOSITE MATERIAL BASED ON TALL OIL AND ITS FATTY ACIDS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 2 (January 27, 2021): 4–9. http://dx.doi.org/10.6060/ivkkt.20216402.6142.
Повний текст джерелаДисертації з теми "Acide furanique"
Kitpaosong, Chaisiri. "Amélioration agronomique et post-recolte de la production d'acide Furanique F2 (FuFA-F2) extrait du latex d'Hevea brasiliensis." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2024. http://www.theses.fr/2024UMONG029.
Повний текст джерелаHevea latex that contains high amount of poly(cis-1,4-isoprene), commonly know as natural rubber, is an essential raw material for producing many products that require elasticity and come from natural sources. The latex consists of various other components, including lipid (~1.3% by weight of fresh latex), with variations depending on the genotypes. In some genotypes, lipids containing a furan structure can be found. These furan fatty acids (FuFA) possess properties such as antioxidation and anti-inflammatory effects, with beneficial activity in preventing heart diseases, improving muscle mass, and preventing metabolic disorders. These properties are important for improving the quality of life, highlighting the potential of Hevea latex for implementing new high-value by-products. In this thesis, 52 rubber genotypes from a small-scale clone trials in Cambodia were studied to assess the genetic variability of the concentration of FuFA in latex. Genotypes related to the PB5/51 rubber strain were found to have the potential to produce FuFA, and the amount of FuFA found was positively correlated with the C16:1 fatty acid content. The highest FuFA concentration in fresh latex was found in IRCA323 clone (0.71 % w/w latex) and the highest production per tapping was from PB235 genotype (2446 mg/tree/tapping). Moreover, in another experimental trial in Thailand, the influence 3 agronomical factors on the latex cell rubber metabolism (assessed by “Latex diagnosis”), and FuFA production was studied: season (monthly samplings on 2 agronomical years), tapping systems (S/2 d2, S/3 2d3, S/2 d3 with stimulation) and genotype (PB235, RRIM600, and RRIT251). As expected, genotype was the main factor influencing FuFA production, with PB235 yielding a high quantity of FuFA. The tapping system had minimal effect on latex cell rubber metabolism and FuFA production. The primary seasonal variation was an increase in latex yield throughout the agronomical year, accompanied by a rise in FuFA yield. No correlation was observed between latex cell rubber metabolism and FuFA content. Extraction and purification strategies for FuFA were investigated using PB235 latex stablized with ammonia. It was found that extraction using ethyl acetate had comparable potential to chloroform-methanol in extracting FuFA. Using silica 60A as the stationary phase appears to be the most effective method for column chromatography to separate FuFA in the form of triglycerides (TG-FuFA) from other lipids found in latex. Moreover, the use of lipolytic enzymes such as GPLRP2 and cutinase for hydrolyzing FuFA-containing lipids and potentially recover FuFA as free fatty acids from stabilized latex was demonstrated. The structural analysis of TG-FuFA using NMR techniques confirmed the FuFA-F2 (9M5) structure. Thermal analysis of TG-FuFA using TGA under nitrogen conditions showed weight changes at 420°C, while under air conditions, weight changes occurred between 200-360°C and 370-530°C. The research findings indicate the possibility of developing rubber genotypes with higher FuFA content, identifying natural solvents suitable for FuFA extraction, and presenting the feasibility of FuFA purification through chromatography or enzymatic techniques
Ayoub, Nadim. "Synthèse et valorisation des dérivés furaniques issus de la biomasse par oxydations sélectives." Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2677.
Повний текст джерелаBiomass is one of the renewable and green resources that can sustainably meet our needs for the production of fuels, chemicals and materials. Indeed, nonedible biomass such as lignocellulose has attracted attention of researchers and scientists in the last decades as a renewable alternative. Furfural and 5-hydroxymethylfurfural (HMF), derived from the dehydration of pentoses and hexoses respectively, are produced in multimillion ton-scale annually. The latter compounds are, therefore, platform molecules and represent a major interest in the context of sustainable development. This work aims to explore novel and green methods for the selective oxidation of furfural and HMF to produce high value-added bio-sourced products such as, 2,5-diformylfuran (DFF), maleic acid and succinic acid. First, an alternative system of HMF oxidation was presented, without the use of noble metal catalysts, high pressures and avoiding the production of toxic wastes. In this context, the gram-scale oxidation HMF leads to the formation of DFF. This reaction was catalyzed by 2-iodobenzenesulfonic acid in the presence of Oxone®. Under optimized experimental conditions, the HMF conversion was found to be 100%, while the DFF yield and selectivity were almost 90%. Subsequently, we demonstrated a catalyst-free process for the gram-scale synthesis of maleic acid from furfural using high frequency ultrasound irradiations. A 70% selectivity of maleic acid with 92% of furfural conversion were achieved without any catalyst under mild conditions using H2O2 as oxidant. Our alternative approach enables the use of biomass instead of petroleum to synthesize maleic acid from furfural in an eco-friendly and energy-efficient process. At last, a novel catalytic process is developed using magnetite nanoparticles, as a cheap and non-noble metal catalyst, and hydrogen peroxide for the oxidation of furfural into succinic acid. Total conversion of furfural was achieved with 67% of succinic acid yield under mild conditions
Girka, Quentin. "Synthèse de dérivés furaniques à partir de biomasse et leur utilisation pour la synthèse de tensioactifs gemini." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS016/document.
Повний текст джерелаDue to stricter reglementations and the development of public opinion, surfactants synthesized from biomass are becoming increasingly interesting. However, the structural diversity of these compounds is still too low to compete with the products synthesized from fossil resources. In order to increase the diversity of available structures, we focused on common furanic building blocks, such as 2,5-diformylfuran (DFF), which are synthesized form carbohydrates. Firstly, we optimized a new and innovative synthesis of DFF. This method allowed us to use neither transition metal catalysts nor ionic liquids. The system we used to convert complex substrates, such as starch, relies on boric acid, sodium bromide and formic acid in dimethylsulfoxide (DMSO). Boric acid plays a key role in this system. It is involved in the biomass deconstruction, glucose to fructose isomerization and HMF formation. Sodium bromide in DMSO promotes the oxidation to DFF and formic acid increases the rate of this step. By using this system, we were able to synthesized DFF from glucose at multigram scale with 20% yield. After optimization of the synthesis, we investigated the oxidation mechanism. The second part of this work was focused on the conversion of DFF into new gemini surfactants. At the end of a five steps transformation, zwitterionic products were obtained with 50% yield. These gemini type compounds shows interesting properties such as very low critical micellar concentration which are similar to these measured for already reported gemini surfactants
Lecomte, Jérôme. "Etude de l'hydroxyméthylation de composés furaniques en milieu aqueux en présence de zéolithes acides." Montpellier 2, 1996. http://www.theses.fr/1996MON20250.
Повний текст джерелаBalmer, Wilfrid. "Etude de la réaction d'hydroxyéthylation et d'hydroxypropylation de composés furaniques en présence de catalyseurs solides acides." Montpellier 2, 1997. http://www.theses.fr/1997MON20204.
Повний текст джерелаPin, Jean-Mathieu. "Matrices thermodurcissables époxydes et furaniques biosourcées – conception d’assemblages macromoléculaires." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4027/document.
Повний текст джерелаThe research work presented in this thesis was oriented on advanced thermoset materials and also on the conception of bio-based polymers and composites. This last topic has been investigated by the combination of different bio-based raw materials which are well-known to have a great potential to substitute the petroleum monomers. Firstly, a fundamental work has been done on the combination of epoxidized linseed oil (ELO) and anhydrides as cross-linkers, which links the polymerization reactivity with the network structure and thermomechanical properties. For being economically realistic, the bio-refineries are urged to valorize the sidestream products issued from biomass conversion. In that respect, a second study investigated successfully the incorporation and copolymerization of an important amount of humins (heterogeneous residues obtained during the sugar conversion into hydroxymethylfurfural (HMF)) with furfuryl alcohol (FA) in order to create new resins. Another proposed combination, focused on ELO and FA cationic copolymerization with the purpose to create new fully bio-based resins with tailored mechanical properties. Concerning the elaboration of advanced polymers and composites, a reflection around the hierarchically organized natural materials has been achieved in order to adapt the self-organization and structuration concepts to polymeric network
Mahmood, Shatha Younis. "Nouvel accès à la série lysergique et à des inhibiteurs bicycliques de glycosidases par réaction de Diels-Alder intramoléculaire à partir de dérivés furaniques." Paris 5, 2006. http://www.theses.fr/2006PA05P637.
Повний текст джерелаThis work presents the synthesis of numerous cycloadducts resulting from the intramolecular Diels-Alder reaction of 3,7-dinitro-11-oxa-tricycloundec-9-ene by two approaches. The first one was used for the synthesis of ergot alkaloids, and the second for the synthesis of new glycosidases bicyclic inhibitors. The first chapter of this thesis describes a general introduction of the ergot alkaloids and a new approach for the lysergic acid synthesis via two key compounds: the 3,7-dinitro-11-oxa-tricycloundec-9-ene-2-carbaldehyde and 2-(2-[1,3] dioxolane-2-yl-ethyl)- 3,7-dinitro-11-oxa-tricycloundec-9-ene. In this work, the synthesis of N-(6-nitro-5,6,7,8-tetrahydro-naphthalene-1-yl)-formamide was achieved and this compound can be considered as an interesting building block for the indole ring synthesis. A strategy could also been develop, using this intermediate, for the preparation of ergot alkaloids derivatives. Also this work opens the access with an excellent stereo control, to new series of polyhydroxylated decahydro-quinoline and isoquinoline, whose can be considered as bicyclic analogues of nojirymicine, fagomine and the miglitol, compounds used in the diabete treatment
Muralidhara, Anitha. "Physico-chemical safety issues pertaining to biosourced furanics valorization with a focus on humins as biomass resource." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2508.
Повний текст джерелаThe present research work was integrated as part of the EU-funded project named HUGS (HUmins as Green and Sustainable precursors for eco-friendly building blocks and materials), involving 5 main partners (Institut national de l'environnement industriel et des risques - France, Avantium - the Netherlands, Institut de Chimie de Nice - France, Universidad De Cordoba- Spain and Leibniz - Institut Fur Katalyse Ev An Der Universitat Rostock- Germany). The project is essentially supported through five European Industrial Doctorate fellowships put in place when the HUGS-MSCA-ITN-2015 program was launched in 2016. The primary objective of the HUGS project was to explore several valorization pathways of so-called “humins” in order to add value and create better business cases. Humins (and similarly lignins) are the side products that may become low-cost feedstock resulting from a number of future biorefineries and sugar conversion processes. Humins are complex residues resulting from the Acid-Catalyzed Dehydration and condensation of sugars, having furan-rings in their polymeric structures. The work presented in this specific part of the HUGS project is essentially focusing on safety-related topics of all components and subsequent applications related to sugar dehydration technology. Priority actions were devoted to a first insight on the characterization of physicochemical safety profiles of the side-product humins and main (parent) furanic products. Some members of this large family of compounds (e.g. RMF and FDCA) have high volume potential which results in opening new doors towards the development of furanbased building blocks and a bio-based economy. Humins are residues or side products which can be burnt for energy. However, its safe and sustainable use in high-value applications could also become a key milestone in the so-called circular economy. In practice, the work has been developed in two main locations: primarily at the INERIS lab, located in Verneuil-en-Halatte and at Avantium, located in Amsterdam. Nearly all experimental research after the production of the components at Avantium was performed at INERIS. This involved the evaluation of physicochemical hazards of both humins (crude industrial humins and humin foams obtained by thermal curing) and a series of furanic compounds. Avantium is involved in the commercialization of humins, furanics and furanic polymers/materials as novel chemicals and materials. The work has encompassed: An extensive bibliographical review of humins, furanics, and their related products (polymers, composites) resulted in the following main conclusions o A lack of physicochemical safety-oriented studies for many furanic compounds and for humins was observed as these products are still in the early stage of development and only a few may be commercialized in the next 5 years.o Despite the limited availability of safety-related data, more studies on toxicity aspects have been conducted for a selected number of furanics than physicochemical safety-related aspects. o A few furanic family members that have been evaluated as biofuel components were found to have given better emphasis on addressing some physicochemical safety attributes. o Every modification of the process for acid-catalyzed sugar dehydration (such as solvent, temperature, residence time and sugar concentration) will result in different humins, which would certainly demand further characterization and safety profiling of the resulting humins. • Analytical development integrating the first examination of flash point distribution versus the Net Heating Values, and analysis of total heats of combustion of furanic compounds. • Design and development of experimental plan addressing the safety-related key parameters such as thermal stability, self-heating risks, fire-risk-assessment and flammability limits depending on the need for specific tests and availability of the test samples